Conjugate Gradient Based Mmse Filter for Cfo Compensation In Uplink Orthogonal Frequency Division Multiple Access Systems
Geethanjali Marri1, P.Sri Padma2, Ch.Ganapathy Reddy3

Manuscript received on November 09, 2013. | Revised Manuscript Received on November 18, 2013. | Manuscript published on November 20, 2013. | PP: 9-13 | Volume-1, Issue-12, November 2013. 
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Abstract: Carrier Frequency Offset (CFO) compensation is very important for reliable detection of transmitted data in uplink Orthogonal Frequency Division Multiple Access (OFDMA) systems. In this paper we proposed a low-complexity CFO compensation algorithm based on the Minimum Mean Square Error (MMSE) criterion for uplink OFDMA systems. The proposed algorithm employs a Conjugate Gradient (CG) method which iteratively finds the MMSE solution. In this paper we are presenting the proposed method by comparing with the existing direct MMSE method and we show that CFO can be compensated with substantially reduced computational complexity by applying the CG method. 
Keywords: Carrier Frequency Offset (CFO), Orthogonal Frequency Division Multiple Access (OFDMA), Conjugate Gradient (CG).